fabulous. I like your idea about the circular hole inserts.
I also have a question? What is the purpose of the little square openings? Are these skuppers?
These take the deck beams, they pass through the sides of the model and finish inside the outer planking. It does result in an extremely strong hull but I feel it may be overkill for the decks on the higher levels, so may resort to traditional means
It is not my design, but one "borrowed" from Dimitry Shevelev